BIOMOLECULES AND ENZYMES

Detailed explanation-1: -A catalyst is a substance that speeds up a chemical reaction, or lowers the temperature or pressure needed to start one, without itself being consumed during the reaction.

Detailed explanation-2: -Catalyst is a substance that increases the rate of reaction and the process is known as catalysis.

Detailed explanation-3: -A catalyst is a substance that either increases or decreases the rate of a chemical reaction without itself undergoing any chemical change. here iron act as a catalyst and increases the rate of chemical reaction.